[R] matrix subset

[Kristel Joossens]

Do you mean simply m[m[,2]>=5,] ?

Kristel

vincent at 7d4.com wrote:
> Dear R-helpers,
> 
> I apologize for this certainly simple question.
> I have the following R lines :
> 
>  > m  = matrix(1:12 , 3 , 4);
>  > m
>       [,1] [,2] [,3] [,4]
> [1,]    1    4    7   10
> [2,]    2    5    8   11
> [3,]    3    6    9   12
> 
>  > m1 = subset(m , m[,2]>=5);
>  > m1
> [1]  2  3  5  6  8  9 11 12
> 
> but in fact I would appreciate m1 to be also a matrix,
> and thus would like to get :
> 
>  > m1
>       [,1] [,2] [,3] [,4]
> [2,]    2    5    8   11
> [3,]    3    6    9   12
> 
> ... but I don't find how to do ?
> (probably it is very simple ! double shame.).
> Thanks for any hint or pointer.
> Vincent
> 
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